Lost admin access to my prestashop

Hi all,

I have never built a site before. I managed to set up a nice store on prestashop and proceeded to take down the "coming soon" notice i had put up (all done using cpanel and softaculous). My site was live at:

*******collection.com/presta

I thought I'd simply have to move all the files from the presta folder into the public_html folder to make my site live at:

*******collections.com

but doing that has caused me to lose both front end and backend access to my site:

on the front end *******collections.com => now a blank white screen and

*******collections.com/presta => shows index of/presta

attempting to access backend administration gives an error "can't establish a connection to the server at localhost".

I did my best to put all the files back where they used to be, but to no avail. it seems i have lost the links to access my site. Any and all help is appreciated in resolving this, because I spent two months building the site and I can't fathom having to redo all that work. i've scoured the forums and i feel quite foolish for being the only one to have done this.

Note: Currently, in my public_html folder, i've moved every file and folder into the presta subfolder except for cgi-bin

Thanks again.